92
MOLESWORTH'S POCKET-BOOK
Surcharged Walls.
In calculating the strength of surcharged walls,
substitute Y for H.
Y being the perpendicular at the end of a line,
L = H, measured, along the
slope to be retained.
Y = 1‘71 Hin slopes of 1 tol
= 1'55H „ „
= 1-45H „ „ 2 „1
= 1-3111 „ „ 3 „1
= 1-24H „ „ 4 „1
Brickwork.
1 rod of brickwork =s 272 sup. ft., 1| brick thick.
n „ = 111 cub. yds. = 306 cub. ft.
„ = 4350 bricks, average work.
n == 5370 bricks, laid dry.
36 bricks flat, or 52 on edge = 1 yard paving.
No. of bricks in 1 cubic yard = 384.
1 load of mortar ..........=1 cubic yard.
2 load of sand.............=1 „ „
3 bag of cement .. .. . = 3 bushels.
4 sack of cement .........= 5 „
5 cubic yard, brickwork re- i 6| cubic feet sand,
quires about...............J 2| „ lime.
330 stock bricks weigh 1 ton.
1000 „ „ 60f cwt.
1000 bricks closely stacked occupy about 55
cubic feet.
Bricks absorb about of their weight.
A bricklayer’s hod measures 16" x 9" x 9 in.
„ „ „ contains 20 bricks.
„ „ „ „ „ | a bushel of mor-
tar, or I cubic foot.